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Phone : 0870 321 6400   Fax : 084458 65536

email : sales2009@handscomb.co.uk

Company no: 3270189,   VAT: UK 686 1567 94











Relay Analyser

Offline Editor


The RELAY CARD TEST SYSTEM is specifically designed so that it will reliably and quickly test relay matrix modules and uncommitted relay modules in automated test systems and similar industrial equipment. The product rapidly locates faults, whether they are intermittent or continuous, in most standard relay boards and with the minimum of intervention in the system. The relay modules can be tested in situ or as a separate bench test, making the operation far more rapid and convenient.

We can also provide a test & repair service for your relay modules if you do not wish to commit yourself to a purchase at the present time, or if your test department is not sufficiently big to justify purchasing the unit.

Patent with patent no GB2412443.

Key Benefits


Simple to Use


Increases Production rate by reducing downtime


Increases confidence in system


Automated functional test equipment used in industry to test electronic circuits typically consists of power supply units, dummy loads, simulated signals and measuring instruments which are connected 'in' and 'out' of the system by relays. At the present time, most of these relay modules do not have any form of "self-test".

The test system facilitates the emergency repairing of equipment that is in current use as well as that needing general overhaul. It also enables reliable and rapid salvaging of modules from redundant equipment and recycling them in new, with the added confidence that the new system will give prolonged and economical use. These features will extend the life of relay modules, achieve a much-reduced machine 'downtime' and give increased confidence in the reliability of systems.

With the addition of a switch control unit, this can be converted to a bench test system. Depending on the make the switch control unit can be the normal card frame / controller used by the relay cards or a universal one produced by Handscomb Consultants Ltd.


1.     To check for permanently stuck ‘on’.

This will find: -

Contacts that have pitted so badly that the peaks on one surface have hooked into the pits on the other surface.

Contacts that have melted, due to high current and then welded together.

A faulty output from an IC permanently energising a relay coil.


2.     To check for relays which are permanently stuck ‘off’.

This can be caused by: -

Contacts too dirty or pitted to make good electrical contact.

A coil not working or giving too weak a magnetic field to cause the contacts to meet.

A blown IC output.

A dirty contact on the connector from the relay card.


3.     To check the relay cards for manufacturing faults

(These types of faults are rare but they do happen sometimes) These can be :-

A short between two lines so that two rows or columns of relays may come on at the same time.

A short between two lines so that two relays may come on at the same time.

A short between two output contacts between different relays.

Two wires to the output connector crossed. This can only happen where the connector is wired to the relay card rather than soldered directly to it.


4.     To check relay contact resistance at the rated current.

This will find dirty contacts and may point to some types of intermittent faults. Even when they do not display the fault symptoms while testing, a higher than normal resistance may highlight potential intermittent faults in this area.


5.     To measure the speed at which contact is made.

This will find the following faults: -

Weak relay coils. These may cause intermittent faults. Even when they do not display the fault symptoms while testing, a slower than normal response may highlight potential intermittent faults in this area.

If there is a known intermittent fault that has not been found the above tests can be repeated continuously, over night if necessary, and any one-off faulty action will be logged.